Add dashboard controller tests.
Add groups controller tests.
Add links controller tests.

Also adds doc formatting to rspec output.

Minor change in the links controller to use links belonging to the
current group, not just any link in the model.
Add tests for colors controller.
Add tests for edit mode.
Change test to use include instead of ==.
Fix typos and tab errors in controller tests.
Remove stubs from color model specs.
Merge pull request #44 from msrose/feature/controller-testing

Feature/controller testing. Closes #36.